<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>

<body>
    <div id="app"></div>
    <script type="text/babel">


        class App extends React.Component{
            state = {
                name : 'aaa',
                age : 18,
                hobby : '吃饭'
            }


            render(){

                const{name,age,hobby} = this.state
                //如果多个数据，写多个事件函数不太合适，
                //可以使用高阶函数写法来解决这种多个传值的问题
                return(
                    <div>
                    输入姓名:
                    <input type="text" value = {name} onChange={this.changeFrom('name')}/>  
                    <br />
                    <br />
                    输入年纪:
                    <input type="text" value = {age} onChange={this.changeFrom('age')}/>
                    <br />  
                    <br />
                    输入爱好: 
                    <input type="text" value = {hobby} onChange={this.changeFrom('hobby')}/>    
                    <br />  
                    <br />  
                    <button onClick ={this.handle}>提交信息</button>
                    </div>
                )
            }

            changeFrom =  (type) => {
                //这里作为外层函数被调用，拿到参数
                //然后返回一个真正的事件函数，形成了闭包，来使用外层函数的接收的变量
                return (e)=>{
                    //解构拿到每次表单变化的值
                    const {value} = e.target
                    //然后给state设置，设置用变量
                    this.setState({[type]:value})
                }
            }

            handle = ()=>{
                const {name,age,hobby} = this.state
                console.log(name,age,hobby);
            }
        }

        const root = ReactDOM.createRoot(document.getElementById('app'));
        root.render(<App />)
  </script>
</body>

</html>